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Java.lang.NullPointerException at java.net.URLEncoder.encode at com.sun.faces.context.UrlBuilder.addValuesToParameter

I am trying to run a jsf application using netbeans and have this NullPointerException in URLEncode. I think there is some problem with Servlet, but I don't know how to fix it. Sources: https://github.com/agoncal/agoncal-application-petstore-ee6

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">


    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>

      

        
        
        
      

    
java.lang.NullPointerException
        at java.net.URLEncoder.encode(URLEncoder.java:204)
        at com.sun.faces.context.UrlBuilder.addValuesToParameter(UrlBuilder.java:318)
        at com.sun.faces.context.UrlBuilder.addParameters(UrlBuilder.java:127)
        at com.sun.faces.context.ExternalContextImpl.encodeBookmarkableURL(ExternalContextImpl.java:1054)
        at com.sun.faces.application.view.MultiViewHandler.getBookmarkableURL(MultiViewHandler.java:407)
        at javax.faces.application.ViewHandlerWrapper.getBookmarkableURL(ViewHandlerWrapper.java:272)
        at org.jboss.weld.jsf.ConversationAwareViewHandler.getBookmarkableURL(ConversationAwareViewHandler.java:132)
        at com.sun.faces.renderkit.html_basic.OutcomeTargetRenderer.getEncodedTargetURL(OutcomeTargetRenderer.java:194)
        at com.sun.faces.renderkit.html_basic.OutcomeTargetLinkRenderer.renderAsActive(OutcomeTargetLinkRenderer.java:158)
        at com.sun.faces.renderkit.html_basic.OutcomeTargetLinkRenderer.encodeBegin(OutcomeTargetLinkRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854)
        at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
        at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)
        at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
        at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
        at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
        at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
        at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
        at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
        at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
        at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
        at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
        at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
        at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
        at java.lang.Thread.run(Thread.java:745)

    Warning:   StandardWrapperValve[Faces Servlet]: Servlet.service() for servlet Faces Servlet threw exception
    java.lang.NullPointerException
        at java.net.URLEncoder.encode(URLEncoder.java:204)
        at com.sun.faces.context.UrlBuilder.addValuesToParameter(UrlBuilder.java:318)
        at com.sun.faces.context.UrlBuilder.addParameters(UrlBuilder.java:127)
        at com.sun.faces.context.ExternalContextImpl.encodeBookmarkableURL(ExternalContextImpl.java:1054)
        at com.sun.faces.application.view.MultiViewHandler.getBookmarkableURL(MultiViewHandler.java:407)
        at javax.faces.application.ViewHandlerWrapper.getBookmarkableURL(ViewHandlerWrapper.java:272)
        at org.jboss.weld.jsf.ConversationAwareViewHandler.getBookmarkableURL(ConversationAwareViewHandler.java:132)
        at com.sun.faces.renderkit.html_basic.OutcomeTargetRenderer.getEncodedTargetURL(OutcomeTargetRenderer.java:194)
        at com.sun.faces.renderkit.html_basic.OutcomeTargetLinkRenderer.renderAsActive(OutcomeTargetLinkRenderer.java:158)
        at com.sun.faces.renderkit.html_basic.OutcomeTargetLinkRenderer.encodeBegin(OutcomeTargetLinkRenderer.java:96)
        at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854)
        at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
        at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)
        at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
        at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
        at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
        at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
        at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
        at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
        at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
        at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
        at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
        at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
        at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
        at java.lang.Thread.run(Thread.java:745)

This happens when I go to index.xhtml

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3 answers


Read the stack trace from bottom to top and select the appropriate lines to understand the flow.

    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)

So the FacesServlet

request is invoked and served.



    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120

So, the render response stage is executed.



    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)

This will create a Facelets (XHTML) file.



    at com.sun.faces.renderkit.html_basic.OutcomeTargetLinkRenderer.encodeBegin(OutcomeTargetLinkRenderer.java:96)

So, a is executed <h:link>

.



    at com.sun.faces.renderkit.html_basic.OutcomeTargetRenderer.getEncodedTargetURL(OutcomeTargetRenderer.java:194)

Thus, it should display the target url.



    at com.sun.faces.context.UrlBuilder.addParameters(UrlBuilder.java:127)

So the link has <f:param>

values ​​that need to be added to the target URL.



    at java.net.URLEncoder.encode(URLEncoder.java:204)

And they must be URL encoded.



java.lang.NullPointerException

However, value

a <f:param>

a <h:link>

appears null

.

I think you get it now?

+12


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I experienced this issue when migrating from GlassFish 4.0 (NetBeans 7) to GlassFish 4.1 (NetBeans 8). That is why <f:param>

it should not be null. In GlassFish 4.0, this is not a problem, and it is just that the parameter was not added to the generated link. But GlassFish 4.1 has a different jsf implementation that doesn't work with NullPointerException

when the value <f:param>

is null.

As the fix I did next. Instead <f:param value="#{myBean.field}"/>

I used <f:param value="#{not empty myBean.field ? myBean.field : ''}"/>

AND using properties alone rendered

won't help. Or it can be rounded with <c:if>

, for example:



<c:if test="#{not empty myBean.field}">
    <f:param value="#{myBean.field}"/>
</c:if>
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I solved this problem by using the disable option for f: param. This code works on Payara 5 (based on Glassfish).

<h:link outcome="nextpage" value="click here">
    <f:param name="id" value="#{myBean.id}" disable="#{empty myBean.id}"/>
</h:link>

The "id" parameter will not be added to the URL if null or empty, and will not be added to the result.

If the link is meaningless when the parameter is empty, you can also disable the entire link and it will turn into plain text (), note that the parameter for the h: link is disabled, not disabled:

<h:link outcome="nextpage" value="click here" disabled="#{empty myBean.id}">
    <f:param name="id" value="#{myBean.id}"/>
</h:link>

Both solutions throw a NullPointerException for URLEncoder.encode.

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